The set of people who answered this question before I did.
There is only one empty set (a consequence of the Axiom of
Extensionality). So the above answer is correct, and is equal to
every other example.
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An Axiom is a mathematical statement that is assumed to be true. There are five basic axioms of algebra. The axioms are the reflexive axiom, symmetric axiom, transitive axiom, additive axiom and multiplicative axiom.
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An axiom system is a set of axioms or axiom schemata from which
theorems can be derived.